CVE-2021-34586: high-severity vulnerability in CODESYS V2
CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)
Published · Updated
26Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 14%
exploitation probability
14%top 4% of all CVEs
observed exploitation
nono source reports it
In short
The CODESYS V2 web server has a flaw where specially crafted requests can crash the server by triggering a null pointer error, making it unavailable to users.
Technical detail
A null pointer dereference vulnerability in CODESYS V2 web server (versions before V1.1.9.22) allows remote attackers to send specially crafted HTTP requests that cause the application to crash, resulting in denial-of-service without requiring authentication.
Summary generated and translated by AI from the official description.
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
CODESYS · CODESYS V2Related CVEs — CODESYS V2
In the same product, most dangerous first.
CVE-2021-34583HIGHCODESYS V2 web server: crafted requests could trigger a heap-based buffer overflow (DoS)EPSS 8.4%CVE-2021-34593HIGHCODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-serviceEPSS 2.7%CVE-2021-34584CRITICALCODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)EPSS 1.1%CVE-2021-34585HIGHCODESYS V2 web server: crafted requests could trigger a pointer dereference with an invalid address (DoS)EPSS 0.9%CVE-2021-34595HIGHCODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-serviceEPSS 0.9%CVE-2021-34596MEDIUMCODESYS V2 runtime: Access of Uninitialized Pointer may result in denial-of-serviceEPSS 0.9%